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Message: <blockquote data-quote="nautica1973" data-source="post: 443293" data-attributes="member: 4949">Briefly, oil chemical composition changes over time. imagine cooking oil from a deep fried pan if used and re-used over a period of say 1,000 cookings would eventually change its viscosity to somewhat thicker in composition. now imagine the same thing in your engine block.With that in mind, the next explanation is SHORT DISTANCE DRIVING deteriorates your engine oil much quicker than long drives. This is due to the oil being warmed up but does not reach its optimum operating temperature when the engines shuts down again when doing short distance drives. Then we zoom in to the molecular composition of oil here to understand that once the changes take place the molecules get all topsy turvy in their bonding and adhesion, either among themselves or adhesion to your metal piston rings, walls etc. which would over time result in wear and tear of metal scraping metal. I have had the pleasure of being shown the sludge from an E60's engine when the owner complied with the BMW service manual of oil changes every 20,000km. the background questions showed that it was short distance drives, irregular usage, 20,000km change. And Walla, the residue that was in the engine block looked very similar to dried rubber paint. So, 5 to 8 thousand kms would be a good indicator to change your engine oils. And bear in mind that your engine runs during traffic lights, traffic jams, stopping to allow stray animals to cross the road safely and the many other times your engine runs whilst you or your spouse runs an errand at the post office</blockquote>

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